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Old 05-02-2021, 02:59 PM   #1
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Breaker replacement on generator

Yesterday I posted something about this but I had my information all wrong. My apologies.

I have a Onan Quiet Diesel 7500 generator. I'm having a problem with the 35 amp 2 pole AC Breaker. I believe it's weak. If I let the inside of the coach get too hot before starting the A/C the breaker keeps tripping until the inside cools down a bit. Then it has no problem. I know it's not the A/C because when I'm plugged into shore power, there is no problem.

I've searched the internet trying to find out how to change out the breaker and what kind to buy but haven't been able to find anything. I'm hoping someone on here can help. I can do simple things but if it's too involved, it's out of my wheelhouse.
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Old 05-02-2021, 03:17 PM   #2
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I ask again, how may AC are you trying to run and what else is on ?
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Old 05-02-2021, 04:13 PM   #3
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Two A/C units. Nothing else of any consequence. We've had this coach for 8 years and never had this problem before. It just started last summer. Of course I do live in AZ so the coach (if sitting in the full sun) can heat up pretty fast if the A/C isn't on.
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Old 05-02-2021, 10:42 PM   #4
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I would connect an amprobe meter on your load wires the breakers are feeding and see what kind of load is on your breakers. If they are kicking prematurely then you would need a new breaker. You also need to check your connections at the breakers and other connections. A loose connection or corroded connection will cause excessive heat and cause the breakers to kick.

So back to your question, there should be an access cover to get to the connections and think you need to start there. I’m thinking if your generator is similar to one of my generators I have owned you may have to remove part of the generator shroud to access the breaker for removal.

I do not know your particular generator so I am trying give the best thoughts from my previous experiences. Hopefully this gives you some where you start.
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Old 05-04-2021, 10:59 PM   #5
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Thanks.
Quote:
Originally Posted by Piros1 View Post
I would connect an amprobe meter on your load wires the breakers are feeding and see what kind of load is on your breakers. If they are kicking prematurely then you would need a new breaker. You also need to check your connections at the breakers and other connections. A loose connection or corroded connection will cause excessive heat and cause the breakers to kick.

So back to your question, there should be an access cover to get to the connections and think you need to start there. I’m thinking if your generator is similar to one of my generators I have owned you may have to remove part of the generator shroud to access the breaker for removal.

I do not know your particular generator so I am trying give the best thoughts from my previous experiences. Hopefully this gives you some where you start.
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Old 05-06-2021, 09:16 AM   #6
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Here is a reference post. Follow advice from others first I would think. Good luck.QD 7500 Circuit Breaker
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